| District of Missouri area codes: 636 | |
|---|---|
| Country | United States |
| State/Province | Missouri |
| Major City | Saint Louis |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 636-324 | Saint Louis | Pond, MO | Socket Telecom |
| 636-326 | Saint Louis | Fenton, MO | Southwestern Bell |
| 636-327 | Saint Charles | Wentzville, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-328 | Saint Charles | Saint Charles, MO | Mci Worldcom Communications, Inc |
| 636-329 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-332 | Saint Charles | Wentzville, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-333 | Jefferson | Maxville, MO | Birch Telecom Of Missouri |
| 636-334 | Franklin | Pacific, MO | Level 3 Communications |
| 636-336 | Saint Charles | Harvester, MO | Mcleodusa Telecommunications Services- Mo |
| 636-337 | Jefferson | De Soto, MO | Southwestern Bell |
| 636-338 | Lincoln | Hawk Point, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-343 | Saint Louis | Fenton, MO | Southwestern Bell |
| 636-344 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-345 | Saint Charles | Harvester, MO | Mci Worldcom Communications, Inc |
| 636-346 | Saint Louis | Saint Louis, MO | Sprint Spectrum L.p. |
| 636-347 | Saint Charles | Saint Charles, MO | American Messaging (am) |
| 636-349 | Saint Louis | Fenton, MO | Southwestern Bell |
| 636-352 | Saint Charles | Saint Charles, MO | Level 3 Communications |
| 636-355 | Lincoln | Foley, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-356 | Lincoln | Moscow Mills, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
There are 353 prefixes, In the code area, the major cities are Ballwin, MO;Chesterfield, MO;O'fallon, MO;St. Char. The major city is Saint Louis.